Lactose intolerance: Lactose tolerance test versus genotyping |
| |
Authors: | Peter Ridefelt Lena D Håkansson |
| |
Institution: | 1. Department of Medical Sciences, Clinical Chemistry, University Hospital, Uppsala, Swedenpeter.ridefelt@medsci.uu.se;3. Department of Medical Sciences, Clinical Chemistry, University Hospital, Uppsala, Sweden |
| |
Abstract: | ObjectiveAdult lactose intolerance, which affects the majority of the population in the world, has been associated with a single nucleotide polymorphism, C-13910T, located upstream of the lactase gene.Material and methodsAdult patients undergoing lactose tolerance tests with lactose challenge and plasma glucose measurements were included in the study comprising 44 Swedes and 7 non-Swedish individuals. A real-time PCR method was established for the genotyping.ResultsOut of 51 patients 48 had concordant results on genotyping and lactose tolerance tests, e.g. ?13910T/T and ?13910C/T genotypes had high glucose elevations. All patients with the heterozygous genotype, ?13910C/T, had high glucose elevations, and no gene–dose relationship was observed when comparing maximal glucose increases for cases with ?13910C/T and ?13910T/T genotypes.ConclusionsGenotyping could replace lactose challenge as a first-stage screening test in adults of European descent, but should be used together with tolerance tests in children and patients where secondary lactose intolerance is suspected. |
| |
Keywords: | Diagnostic techniques digestive system genotype lactose intolerance lactose tolerance test polymorphism single nucleotide |
|
|